Designed for informal brushout applications, the paper stock
is almost twice the thickness of regular chart paper to give
greater rigidity for more convenient handling - nominal
thickness: 0.5 mm (20 mils).
One of the earliest hiding power test surfaces was linoleum
with a black and white checkerboard pattern. This was soon
replaced by sealed paperboard charts of which Forms 10H and
10H-BG Spreading Rate Charts are typical examples. Designed
for brushout tests at specified spreading rates such as in
ASTM Method D 344 and Canadian1-GP-71, they are also used
for drawdown applications like their smaller counterparts
Forms 10A and 10B. Black and gray squares in Form 10H-BG
provide reduced contrast for testing coatings with lower
hiding power.
Painted steel panels, used for measuring the hiding power of
powder coatings and industrial enamels. Available in half
black / half white and all black.
The black surface: Solvent resistant, Non-bleeding,
Reflectance - 1% maximum - measured using ASTM Method E 1347
The term "Opacity Chart" refers to charts on which the test
pattern is a simple combination of black and white areas,
large enough for wide aperture reflectance instruments, as
well as for visual opacity and color observations.
These combine the test areas and functions of a PENetration
and an OPACity chart. They can be considered as universal
test charts for research, development and quality control.
The choices offered in size and design are responsive to
individual laboratory needs and preferences. Form 19BR
includes an un-lacquered black area, but is otherwise
equivalent in functionality.
In a typical scrub test, the coating is applied to the
Leneta Scrub Test Panel at a specified film thickness,
allowed to dry, then subjected to scrubbing with a
straight-line scrub tester.
These are pressure sensitive labels with a hiding power test
pattern and a sealed, solvent-resistant surface. They are
used primarily with metal panels on which the uniform
surface provides no visual clue as to the thickness of an
applied paint film.
These are used by industrial coatings laboratories,
principally those involved with the automotive industry, to
measure the hiding power of spraying enamels. The chart is
attached to a steel panel and the test coating sprayed to
produce a "wedge" varying from thin at one end to thick at
the other.
